Egypt's disputed Islamist-backed constitution has been passed with a 63.8% "yes" in a referendum, the election commission has announced, rejecting opposition allegations of significant vote fraud.
Mohammed Badie, leader of the Muslim Brotherhood, offered congratulations on the passing of the constitution and said Egyptians continue to "teach" the world.
"Let's all begin to build the renaissance of our country with free will, good intentions and strong determination, men, women, Muslims and Christians," Mr Badie said on his Twitter account. The Brotherhood was the main group that backed the charter.
This is the first constitution since Mr Mubarak was ousted. The opposition had campaigned against it with massive street protests that sometimes turned deadly, arguing that it will usher in Islamic rule in Egypt and restrict freedoms. It has vowed to challenge the referendum results and fight for a share of power in the upcoming parliamentary vote expected within two months.
Judge Samir Abou el-Maati, the head of the electoral commission, denied allegations that judicial supervision was lacking in the vote. He said the total number of people who voted against the constitution was 6.06 million out of 16.7 million valid votes, or about 36.2%.
Opposition spokesman Khaled Dawoud said the judge did not address complaints about overcrowding of polling stations. The opposition says the overcrowding was due to a boycott by some judges who traditionally oversee elections and that was a major factor in the low turnout. He also said Abou el-Maati did not address violations such as backers of the constitution instructing voters to cast a "yes" ballot within the polling stations.
Mr Dawoud said: "We still believe because of the low turnout, this is not the constitution the Egyptians people had aspired for. This is not a constitution that will last for a long time."
Mr Dawoud said the National Salvation Front, the main opposition group that brings together liberal, left-wing parties and other groups, will continue to fight the constitution through preparing for the parliamentary elections. In the parliament, the group will work to amend the constitution, which he said restricts freedoms and undermines social and economic rights of Egyptians.
Mr Abou el-Maati said results were thrown out from polling stations where violations, such as closing early or improper supervision. He also denied that Christians were preventing from casting their ballots at some stations, a claim widely reported during the two stages of voting on December 15 and December 22. The official results closely mirror unofficial results announced by the Muslim Brotherhood, which said 64% voted "yes."